People retire every day. Baby boomers are retiring, but it's spread out over several years (they don't all retire at once!).
This is from September....844,000 people in just ONE month quit looking for work. It had nothing to do with retirement!
Discouraged In Hunt For A Job, Many Stop Looking
'Discouraged' is not just a state of mind. It's an official term the Labor Department uses to describe the 844,000 people who last month had given up on trying to find a job because they didn't think there was anything out there for them. So while the unemployment rate edged down this month, there are also more people who have quit sending out resumes, put their best suits back in the closet and stopped looking for work altogether. http://www.npr.org/2012/09/14/161095920/discouraged-in-hunt-for-a-job-many-stop-looking